Garden Arch For Protecting Plants

Hubby used a garden arch to put planks on for some plants I was saving to take with us when we move (don't know when that will be now). It started to get cold here in So.Ca. and I was afraid we might have a freeze like last year. So he made this spot for the plants and we covered it with a tarp for the cold nights and took it off during the daytime. Now I just water and cover when needed.